A tire design method that shares the same profile for both tubed and tubeless tires.

Abstract

This invention discloses a tire design method for a shared profile for both tubed and tubeless tires. The tire mold consists of tread blocks, sidewalls, and a bead ring. The specific method includes: determining the outer diameter and cross-sectional width of the mold for the shared profile tire based on the outer diameter and cross-sectional width of both tubed and tubeless tires; determining the tire profile dimensions based on the dimensional relationships of the tread, sidewall, and bead profiles of both tubed and tubeless tires; determining the tire structure design based on the structural relationships of the tread, sidewall, and bead structures of both tubed and tubeless tires; and manufacturing a tire with the shared profile for both tubed and tubeless tires based on the tire dimensions and structural design obtained from the above steps. This invention replaces the bead design for both tubed and tubeless tires with a shared profile, improving the performance of both tubed and tubeless tires, saving costs, and increasing efficiency.

Description

Technical Field

[0001] This invention relates to the field of tire technology, and in particular to a tire design method that allows for the use of a shared profile for both tubed and tubeless tires. Background Technology

[0002] Currently, the TBR tire market is divided into three types: the first is the tube-type tire (TT), the second is the tubeless tire (TL), and the third is a type of tire that is compatible with both tube-type and tubeless rims of the same specification. The first and second types are designed independently, only meeting the standards and market performance corresponding to a single specification. Changes in vehicle market demand necessitate redesigning the tire specifications, and the significant differences in profile between various specifications require repeated calculations and verifications to obtain a suitable product. The third type allows a single tire specification to be used with both deep-groove rims (for tubeless tires) and flat-bottom rims (for tubed tires), such as the 325 / 95R24 tire specification.

[0003] Current technology designs the outer contours of tubed and tubeless tires independently, making it impossible for product performance to simultaneously meet the performance requirements of both types. To ensure both products meet market usage conditions, repeated calculations and verifications are necessary. Current technology also cannot allow for product replacement by simply changing the steel bead ring, nor can it create two separate products (tubed and tubeless) by altering the bead structure. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology. To achieve the above objective, a tire design method that uses a shared profile for both tubed and tubeless tires is adopted to solve the problems mentioned in the background art.

[0005] A tire design method for tires with and without tubes sharing a common profile, wherein the tire mold consists of tread blocks, sidewall plates, and bead steel ribs, and the specific steps of the tire design method include:

[0006] Step S1: Determine the outer diameter and cross-sectional width of the mold for the tire with a common profile based on the outer diameter and cross-sectional width of the tubed and tubeless tires.

[0007] In this embodiment, the key difference between tubeless and tubeless products is the difference in the bead steel ribs, while other molds are shared.

[0008] Step S2: Determine the tire profile dimensions that share a common profile based on the dimensional relationship between the crown profile, sidewall profile, and bead profile of tubed and tubeless tires.

[0009] Step S3: Determine the tire structure design of the common profile based on the structural relationship of the crown structure, sidewall structure and bead structure of tubed and tubeless tires.

[0010] Step S4: Based on the tire dimensions and structural design obtained in the above steps, manufacture tires with and without tubes that share the same profile.

[0011] As a further aspect of the present invention, the specific steps in step S1 include:

[0012] Select tubed and tubeless tires with similar external dimensions. The tire size selection method is as follows:

[0013] Select the range of outer diameter D1 (d1, d2) with inner tube and the range of outer diameter D2 (d3, d4) without inner tube. Select the minimum value of the intersection of outer diameters a=max(d1, d3) and the maximum value of the intersection of outer diameters b=min(d2, d4).

[0014] Select the range of inflatable cross-section widths W1 (w1, w2) with inner tubes and the range of inflatable cross-section widths W2 (w3, w4) without inner tubes. The minimum value of the intersection of cross-section widths is c=max(w1, w3), and the maximum value of the intersection of cross-section widths is d=min(w2, w4).

[0015] Based on the above range values, the variation law between inflation size and mold size is determined according to existing processes and previous product design experience, and the outer diameter OD and cross-sectional width SW of the mold for the common contour tire are obtained.

[0016] As a further aspect of the present invention: the specific steps of designing the tire crown profile in step S2 include:

[0017] The mold crown of the tubed and tubeless tires is composed of two crown arcs, wherein the two crown arcs are tangent and the radius TR1 and arc length TL1 of the first crown arc, and the radius TR2 and arc length TL2 of the second crown arc satisfy the following relationship;

[0018] TR2=(0.80-1.00) TR1;

[0019] TL2 = (0.80 - 1.10) TL1;

[0020] The vertical distance from the end of the entire crown arc to the center outer diameter of the tire must satisfy the following relationship:

[0021] h = (0.015~0.035) TW;

[0022] Where h is the crown arc height and TW is the driving surface width.

[0023] As a further aspect of the present invention: the specific steps of tire sidewall profile design in step S2 include:

[0024] The sidewall profile is composed of multiple arc segments, from point P, the intersection of the tire crown and the sidewall, to point R, the parting line between the sidewall and the bead, and from point P to point R, it is composed of arc segments SR1, SR2...SRn,n connected in sequence.

[0025] To balance the deformation caused by stress in the shoulder and bead areas of both tubeless and tubeless tires, and to obtain a common profile for the sidewalls of both tubeless and tubeless tires, the following relationship must be satisfied:

[0026] LH1 = (1.05~1.25) UH;

[0027] LH2 = (0.85~1.05) UH;

[0028] Wherein, UH is the same upper section height for tubed and tubeless tires, LH1 is the lower section height for tubed tires, and LH2 is the lower section height for tubeless tires.

[0029] As a further aspect of the present invention: the specific steps of tire bead contour design in step S2 include:

[0030] The sidewall arc SRn, which has both inner tube and tubeless bead outlines, is tangent to the intersection point R of the sidewall plate and the bead steel rib mold parting line.

[0031] Given an inner tube with bead width BW1 and a tubeless tire with bead width BW2, and referring to standards, use an inner tube rim with width B1 and a tubeless rim with width B2, satisfying the following relationship:

[0032] BW1 = (1.0 ~ 1.13) B1;

[0033] BW2 = (1.0~1.13) B2;

[0034] The mold side plate contours with and without inner tube bead contours are shared, and the mold assembly line positions are the same.

[0035] As a further aspect of the present invention, the specific steps in step S3 include:

[0036] Step S31: Determine the tire crown structure design:

[0037] The tire crown is composed of a tire body, a first belt layer, a second belt layer, a third belt layer, a fourth belt layer, and a tire crown rubber composite component;

[0038] Among them, the widest width of the belt layer WB and the projected length of the crown arc on the tire's radial section, i.e., the tire's running surface width TW, satisfy the following relationship:

[0039] WB = (0.75-0.90) TW;

[0040] The thickness TN1 from point O, the center position of the tread, to the centerline of the tread body, and the perpendicular distance TN2 from point P, the intersection of the tread and the sidewall, to the centerline of the tread body, satisfy the following relationship:

[0041] TN1 = (0.65~0.85) TN2;

[0042] Step S32: Determine the tire sidewall structure design:

[0043] The sidewall structure uses the same sidewall contour for both tubed and tubeless tires.

[0044] Step S33: Determine the bead structure design:

[0045] The bead structure is a replaceable structure with both inner tube and tubeless bead steel ribs.

[0046] Compared with the prior art, the present invention has the following technical advantages:

[0047] The above-described technical solution, employing a tire design method that uses a shared profile for both tubed and tubeless tires, allows different tubed and tubeless tires with similar external dimensions to adapt to different sizes of tubed and tubeless rims by replacing the tubed and tubeless bead designs with a shared profile. The applicability of this new design method must simultaneously consider the usage standards for both tubed and tubeless tires, market usage environments (vehicle models, loads, etc.), and market performance requirements. This design method simplifies design, allowing for the adjustment of the bead to achieve different sizes of tubed and tubeless tires while maintaining or further improving the performance of both tubed and tubeless products after the shared profile is implemented, significantly saving development manpower, financial resources, and materials. Furthermore, it facilitates production, enabling switching between tubed and tubeless tire production simply by replacing the steel bead mold, thus improving factory production efficiency. Attached Figure Description

[0048] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings:

[0049] Figure 1 This is a schematic diagram illustrating the steps of a tire design method according to an embodiment of this application;

[0050] Figure 2 This is a schematic diagram of the structure of a tire mold according to an embodiment of this application;

[0051] Figure 3This is a schematic diagram showing the range of inflatable outer diameter and inflatable cross-sectional width for tubed and tubeless tubes according to embodiments of this application.

[0052] Figure 4 This is a structural schematic diagram of the tire profile design according to an embodiment of this application;

[0053] Figure 5 This is a schematic diagram of the tire crown structure, tire sidewall structure, and tire bead structure according to an embodiment of this application.

[0054] In the diagram: 1-Tire crown, 2-First belt layer, 3-Second belt layer, 4-Third belt layer, 5-Fourth belt layer, 6.1-Inner tube carcass, 6.2-Innerless carcass, 7.1-Inner tube wire wrapping, 7.2-Innerless bead wrapping, 8.1-Inner tube wire bead, 8.2-Innerless wire bead. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] Please refer to Figure 1 and Figure 2 In this embodiment of the invention, a tire design method for tires with and without tubes sharing a common profile is provided. The tire mold consists of tread blocks, sidewall plates, and bead steel ribs. The specific steps of the tire design method include:

[0057] Step S1: Based on the outer diameter and cross-sectional width of tubed and tubeless tires, determine the outer diameter and cross-sectional width of the mold for the common profile tire. Specific steps include:

[0058] In this embodiment, as Figure 3 As shown in the figure, the diagram illustrates the range of values ​​for the outer diameter and cross-sectional width of the inflated tube with and without an inner tube.

[0059] According to the standard, select tubed and tubeless tires with similar external dimensions, and determine the overlapping area between them, as follows:

[0060] Select the range of outer diameter D1 (d1, d2) with inner tube and the range of outer diameter D2 (d3, d4) without inner tube. Select the minimum value of the intersection of outer diameters a=max(d1, d3) and the maximum value of the intersection of outer diameters b=min(d2, d4).

[0061] Select the range of inflatable cross-section widths W1 (w1, w2) with inner tubes and the range of inflatable cross-section widths W2 (w3, w4) without inner tubes. The minimum value of the intersection of cross-section widths is c=max(w1, w3), and the maximum value of the intersection of cross-section widths is d=min(w2, w4).

[0062] By using the above range values, the variation law between inflation size and mold size is determined, and the outer diameter OD and cross-sectional width SW of the mold for the common contour tire are obtained.

[0063] Step S2: Determine the tire profile dimensions that share a common profile based on the dimensional relationship between the crown profile, sidewall profile, and bead profile of tubed and tubeless tires.

[0064] In this embodiment, as Figure 4 As shown in the diagram, this is a structural schematic diagram of tire profile design. The specific steps for tire profile dimensioning are as follows:

[0065] Step S21, the specific steps of tire crown profile design include:

[0066] To simultaneously meet the wear and tread durability requirements of both tubeless and tubeless tires, the tread profile design requirements are as follows:

[0067] The mold crown of the tubed and tubeless tires is composed of two crown arcs, wherein the two crown arcs are tangent and the radius TR1 and arc length TL1 of the first crown arc, and the radius TR2 and arc length TL2 of the second crown arc satisfy the following relationship;

[0068] TR2=(0.80-1.00) TR1;

[0069] TL2 = (0.80 - 1.10) TL1;

[0070] The vertical distance from the end of the entire crown arc to the center outer diameter of the tire must satisfy the following relationship:

[0071] h = (0.015~0.035) TW;

[0072] Where h is the crown arc height and TW is the driving surface width.

[0073] Step S22, the specific steps of tire sidewall profile design include:

[0074] In this embodiment, in order to satisfy the shared profile of the sidewall of both tubed and tubeless tires, the sidewall profile is composed of multiple arc segments. From point P, the intersection of the tire crown and the sidewall, to point R, the parting line between the sidewall and the bead, the segments from point P to point R are SR1, SR2, ..., SRn, and there are a total of n arc segments connected together.

[0075] Since the position of the horizontal axis of the cross section has a significant impact on the force distribution of the tire, when it is biased towards the crown, it will cause increased distortion of the belt layer and increase the rate of shoulder failure. When it is biased towards the bead, it will cause the bead to deform and become larger, resulting in early tire failure.

[0076] To balance the deformation caused by stress in the shoulder and bead areas of both tubeless and tubeless tires, and to obtain a common profile for the sidewalls of both tubeless and tubeless tires, the following relationship must be satisfied:

[0077] LH1 = (1.05~1.25) UH;

[0078] LH2 = (0.85~1.05) UH;

[0079] Wherein, UH is the same upper section height for tubed and tubeless tires, LH1 is the lower section height for tubed tires, and LH2 is the lower section height for tubeless tires.

[0080] Step S22, the specific steps for designing the tire bead profile include:

[0081] The sidewall arc SRn, which has both inner tube and tubeless bead outlines, is tangent to the intersection point R of the sidewall plate and the bead steel rib mold parting line.

[0082] Given an inner tube with bead width BW1 and a tubeless tire with bead width BW2, and referring to standards, use an inner tube rim with width B1 and a tubeless rim with width B2, satisfying the following relationship:

[0083] BW1 = (1.0 ~ 1.13) B1;

[0084] BW2 = (1.0~1.13) B2;

[0085] The mold side plate contours with and without inner tube bead contours are shared, and the mold assembly line positions are the same.

[0086] Step S3: Determine the tire structure design with a common profile based on the structural relationships of the crown structure, sidewall structure, and bead structure of tubed and tubeless tires. Specific steps include:

[0087] Step S31: Determine the tire crown structure design:

[0088] In this embodiment, as Figure 5 As shown, the diagram illustrates the structure of the tire crown, sidewall, and bead for both tubeless and tubeless tires.

[0089] The outlines and belt layers of the inner tube and tubeless tires are the same, thus ensuring that their wear and durability are comparable. The tread of the inner tube and tubeless tires consists of the tire body, the first belt layer, the second belt layer, the third belt layer, the fourth belt layer, and the tread rubber composite.

[0090] Among them, the widest width of the belt layer WB and the projected length of the crown arc on the tire's radial section, i.e., the tire's running surface width TW, satisfy the following relationship:

[0091] WB = (0.75-0.90) TW;

[0092] The thickness TN1 from point O, the center position of the tread, to the centerline of the tread body, and the perpendicular distance TN2 from point P, the intersection of the tread and the sidewall, to the centerline of the tread body, satisfy the following relationship:

[0093] TN1 = (0.65~0.85) TN2;

[0094] Step S32: Determine the tire sidewall structure design:

[0095] The sidewall structure uses the same sidewall contour for both tubed and tubeless tires, requiring the dimensions of the two semi-finished products to be close, so as to ensure that the performance of the finished products is comparable.

[0096] Step S33: Determine the bead structure design:

[0097] The bead structure is a replaceable structure with both inner tube and tubeless bead steel ribs.

[0098] Specifically, by selecting existing tire bead structure materials for both inner tube and tubeless tires, and replacing the steel ribs of the inner tube and tubeless tire beads, it becomes possible to produce both inner tube and tubeless tires. Furthermore, since the contours are shared, replacing the inner tube and tubeless tire beads does not compromise the performance of either product.

[0099] Step S4: Based on the tire dimensions and structural design obtained in the above steps, manufacture tires with and without tubes that share the same profile.

[0100] In this embodiment, the method is applicable to products with similar cross-sectional width and outer diameter, including but not limited to the specifications shown in Table 1 below:

[0101] Table 1

[0102]

[0103] In this embodiment, to facilitate production, the implementation case uses a single mold for comparison, as shown in Table 2 below:

[0104]

[0105] According to Table 2, we can obtain:

[0106] Compared to the previous example, the number of patterned blocks and side plates was reduced by half, and the mold cost index was 60% higher (mold costs and the cost of patterned blocks and side plates accounted for the majority); the production efficiency index could also be improved by 15% (reducing the frequency of mold replacement during production, and only the steel ring mold needs to be replaced for the production of shared products).

[0107] Among them, the mold capital index represents the total amount required to purchase a set of molds; the higher the index, the more cost-effective the purchase.

[0108] Production efficiency index: represents the time required for a person to change a mold; the higher the index, the more time is saved.

[0109] Table 3 below shows examples of tubed products:

[0110] Table 3

[0111]

[0112] Table 4 shows examples of tubeless products:

[0113]

[0114] Based on Tables 3 and 4 above, we can obtain:

[0115] The higher the value of the above evaluation parameter, the better the result;

[0116] The above indices, ranging from 95 to 105, indicate comparable performance.

[0117] Comparing Comparative Example 1 with Examples 1 to 9, by adopting a design method that uses a shared profile tire for both inner tube and tubeless tires (TT & TL), the following parameters are adjusted: first crown radius TR1, second crown radius TR2, first crown width TL1, second crown width TL2, horizontal axis height LH1 of the inner tube section, horizontal axis height LH2 of the tubeless section, crown height h, bead fit and width BW1 of the inner tube, bead fit and width BW2 of the tubeless tire, widest belt layer WB, thickness TN1 from the center point O of the crown to the center line of the tire body, and perpendicular distance TN2 from the intersection point P of the crown and the sidewall to the center line of the tire body. This allows for the replacement of inner and tubeless bead fits to maintain or further improve the performance of each tire after using a shared profile tire.

[0118] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of the invention is defined by the appended claims and their equivalents, all of which should be included within the scope of protection of the invention.

Claims

1. A tire design method that shares a common profile for both tubed and tubeless tires, characterized in that, The tire mold consists of tread blocks, sidewall plates, and bead steel ribs. The specific steps of the tire design method include: Step S1: Based on the outer diameter and cross-sectional width of tubed and tubeless tires, determine the outer diameter and cross-sectional width of the mold for the common profile tire. The specific steps include: Select tubeless and inner tubed tires with similar or identical external dimensions. The method for selecting mold dimensions is as follows: Select the range of outer diameter D1 with inner tube inflation [d1, d2], and the range of outer diameter D2 without inner tube inflation [d3, d4]. Select the minimum value of the intersection of outer diameters a=max(d1, d3) and the maximum value of the intersection of outer diameters b=min(d2, d4). Select the range of inflatable cross-section widths with inner tubes [w1, w2] and the range of inflatable cross-section widths without inner tubes [w3, w4]. The minimum value of the intersection of cross-section widths is c=max(w1, w3), and the maximum value of the intersection of cross-section widths is d=min(w2, w4). Based on the above a, b, c, and d, the variation law between inflation size and mold size is determined, and the outer diameter OD and cross-sectional width SW of the mold for the common contour tire are obtained. Step S2: Determine the tire profile dimensions that share a common profile based on the dimensional relationship between the crown profile, sidewall profile, and bead profile of tubed and tubeless tires. Step S3: Determine the tire structure design with a common profile based on the structural relationships of the crown structure, sidewall structure, and bead structure of tubed and tubeless tires. Specific steps include: Step S31: Determine the tire crown structure design: The tire crown structure consists of a tire body, a first belt layer, a second belt layer, a third belt layer, a fourth belt layer, and a tire crown rubber composite component; Among them, the widest width of the belt layer (WB) and the tire travel width (TW) satisfy the following relationship: WB =(0.75-0.90) TW; The thickness TN1 from point O, the center position of the tread profile, to the centerline of the tread body, and the perpendicular distance TN2 from point P, the intersection of the tread profile and the sidewall profile, to the centerline of the tread body, satisfy the following relationship: TN1 =(0.65~0.85) TN2; Step S32: Determine the tire sidewall structure design: The sidewall structure is shared by both tubed and tubeless tires. Step S33: Determine the tire bead structure design: The bead structure is replaced by the bead structure of tubed and tubeless tires. Step S4: Based on the outline dimensions and structural design obtained in the above steps, manufacture tires with and without tubes that share the same outline.

2. The tire design method for a tire with a shared profile for both tubed and tubeless tires according to claim 1, characterized in that, The specific steps for designing the tire crown profile in step S2 include: The crown profile of the tubed and tubeless tires is composed of two crown arc segments, wherein the two crown arc segments are tangent to each other and the radius TR1 and arc length TL1 of the first crown arc segment, and the radius TR2 and arc length TL2 of the second crown arc segment, satisfy the following relationship: TR2=(0.80-1.00) TR1; TL2=(0.80-1.10) TL1; The crown height is the vertical distance from the end of the entire crown arc to point O, the center of the tire crown profile, and satisfies the following relationship: h=(0.015~0.035) TW; Where h is the crown arc height and TW is the driving surface width.

3. The tire design method for a shared profile for both tubed and tubeless tires according to claim 1, characterized in that, The specific steps for designing the tire sidewall profile in step S2 include: The sidewall profile is composed of a series of arcs connected from point P, the intersection of the crown profile and the sidewall profile, to point R, the parting line between the sidewall profile and the bead profile, in sequence as SR1, SR2...SRn,n. To balance the deformation caused by stress at the shoulder and bead areas of tubed and tubeless tires, a common sidewall profile for both types of tires is obtained, satisfying the following relationship: LH1=(1.05~1.25) UH; LH2=(0.85~1.05) UH; Wherein, UH is the same upper section height for tubed and tubeless tires, LH1 is the lower section height for tubed tires, and LH2 is the lower section height for tubeless tires.

4. The tire design method for a shared profile for both tubed and tubeless tires according to claim 3, characterized in that, The specific steps for designing the tire bead profile in step S2 include: According to the sidewall profiles of tubed tires and tubeless tires, the sidewall arc SRn is tangent to the parting line R between the sidewall profile and the bead profile. Determine the bead fit and width BW1 for tubed tires and the bead fit and width BW2 for tubeless tires. Refer to the standard and use the rim width B1 for tubed tires and the rim width B2 for tubeless tires, satisfying the following relationship: BW1=(1.0~1.13) B1; BW2=(1.0~1.13) B2.

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